Furnace-door frame and dead-plate.



PATENTED JUNE 7, 1904.

J. D. WRIGHT. DDRNADD DooD FRAME AND DEAD PLATE.

APPL10ATION FILED 00T. 13, 190B.

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No. 761,746. PATENT-ED JUNE 7, 190.4.

' J. E. WRIGHT.

FURNAGE DOOR FRAME AND `DEAD PLATE.

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EATENTED JUNE 7, 19014. .J. E. WEIGHT. E E EU'ENAGE DooE EEAME ANEDEAD PLATE.

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W7 TNESS 561 UNITED STATESl Patented j' une 7, 1904.

'PATENT OFFICE.-

. JOI-IN FBENEZER WRIGHT, OF BARROVV-IN-FURNESS, ENGLAND.

FURNACE-DOOR FRAME AND DEAD-PLATE.

SPECIFICATION forming part ofl Letters Patent No. 761,746, `elated June '7, 1904.

Application led October 13, 1903.

To 'a/ZZ whom t may concern.-

Be it known thatLJoHN EBENEZER WRIGHT,

a subject of the King of England, and a resident of Barrow-in-Furness, in the county of Lancaster, England, have invented certain new and useful Improvements in Furnace- .Door Frames and Dead-Plates, of which the following is a specification.

The invention refers to the furnace-door frames and dead-plates of furnaces subjected is great (such as in water-tube boilers) vthe metal arch or support which carries the brickworl'r above the stoking-d oorway gets very hot and unable to bearl the weight ofthe brickwork (which is also very hot) above it, especially after it is burned away. According to this invention this is prevented by extending the ldoorway-frame inward under the brickwork lining at the front of the generator and making it hollow and open at the front and making the sides and dead-plate hollow and con-v necting all these hollow chambers with the ashpit below the bars, so that the whole or a considerable portion of the air supplied to the ashpit may pass by way of these air-channels from the furnace-door frame.- This is illustrated in the'accompanyingdrawings, in which- Figure lis alongitudinal section. Fig. 2 is a plan in section taken at the l-ine Fig. l; and Fig. 3 is a plan of the portion of the deadplate separate, showing the vconstruction wherein the frame and the dead-plate are made separately and detachable, while Fig. i is a longitudinal section, Fig. 5 a front View, and Fig. 6 a plan, half in' section, showing the construction wherein the dead-plate and frame are in one.

Referring to the drawings, a represents the ordinary metal casing of the front of a steam- Serial No. 176,899. (No model.)

generator furnace. is the brickwork inside it.v c represents-the fire-bars, and OZ is the ashpit.

e designates generally the furnace door frame, and f designates generally the deadplate between the door and the front ends of the fire-bars c, and g is the furnace-door.v

, The furnace-door frame e consists of three portions-namely, av roof or arched portion /L open for its entire length on the outside of the furnace at o' and closed at the inner end, and twohollow side portions j', communicating directly with the interior of the arch i at their upper ends and with the sides of the hollow dead-plate f at theirlower ends,partial diaphragms 2c being being cast in the sides j and on the opposite sides of it to give thc air a longer and zigzag course through them. The front edge of the upper plate forming the roof of the hollow dead plate f rests on the upper face of an angle-bar Z, and the front of the lower plate or Hoor of the hollow dead-plate f rests on the upper face of an angle-bar m inside the casing a, these two bars being fastened in place to the casing by bolts a and the hollow plate f being held in position by the screw-studs 0.

The upper plate .of the dead-plate f has an opening p at each side-that is, it is perforated at p-into which the lower ends of the sides j' of the frame fit, -and these lower ends being open direct communication from the sides with the interior of the dead-plate f is effected.

The entrance of air to the ash-pit d by way of the hollow door-frame e and dead-platef is controlled by a damper g, mounted and adapted to slide on the under side of the deadplate and over the opening r in the back end of the iioor of the dead-plate, it being operated by a rod s, connected with it and extending through the front case a and provided with a handle t on its outer end.

In the cases shown the dead-plate f is divided longitudinally by a partition, forming it into two chambers, in connection with each of which a separate damper q and operating.- handle t are employed'.

In action the whole or a greater or less amount-of the air required 'for combustion is IOO passed into the arch 7L of the door-frame e through the open front at i extending across it and down the hollow sides 7' into the two portions ofthe dead-platef and thence by way of the openings fr into the ash-pit, with the result that the metal is kept below the burningpoint-thatis,below red heat-and its strength for supporting the briekwork b is in consequence retained; but the cooling effect may be further increased by admitting jets of steam into the front portion e' along with the air.

By the construction shown in Figs. l to 3 when the dead-plate f or the frame a becomes Worn out or broken the one or the other can be renewed by the detachable construction Set forth.

In the modification shown in Figs. 4to 6 the dead-platefl and frame c are cast in one, the dead-plate being' inclined, and the valves q work in connection with the opening fr at the back 'end of the dead-plate. In other respects the construction is the same practically as that set forth with reference to Figs. l to 3.

Having now particularly described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a furnace, the combination with the casing o ofthe furnace and brick lining b within same, of the door-frame e, comprising a hollow roof L on which the bricks are supin free communication with the hollow roof /1/ at their upper ends; and a hollow dead-plate f connected with the lower ends of the hollow sides j, and having its interior communicating` with the said lower ends, and a discharge-owning fr in the inner end of the dead-plate f; substantially as set forth.

2. In a furnace, the combination with the casing of the furnace and brick lining within same, of the door-frame e, comprising a hollow roof /L on which the bricks are supported, and open in the front at ff, to the outside atmosphere, and closed at the inner end; hollow sides l7' in free communication with the hollow roof at their upper ends; a hollow dead-plate f connected with the lower ends` of the hollow sides j, and having its interior communicating with the said lower ends, and a discharge-opening fr in the inner end of the dead-platef,l and a damper q adapted to cover and uncover the opening lrv; substantially as set forth. t

In witness whereof l have hereunto set my hand in presence of two witnesses.

JOHN ICBENEZER lVRlHllT.

Witnesses:

SoMEnvILLE GoopALL, GUY Olin. 

